1 files changed, 339 insertions, 0 deletions
diff --git a/bin/sh/main.c b/bin/sh/main.c
new file mode 100644
index 000000000000..4d0aae96215f
--- /dev/null
+++ b/bin/sh/main.c
@@ -0,0 +1,339 @@
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * Copyright (c) 1991, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kenneth Almquist.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef lint
+static char const copyright[] =
+"@(#) Copyright (c) 1991, 1993\n\
+	The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)main.c	8.6 (Berkeley) 5/28/95";
+#endif
+#endif /* not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <stdio.h>
+#include <signal.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <locale.h>
+#include <errno.h>
+
+#include "shell.h"
+#include "main.h"
+#include "mail.h"
+#include "options.h"
+#include "output.h"
+#include "parser.h"
+#include "nodes.h"
+#include "expand.h"
+#include "eval.h"
+#include "jobs.h"
+#include "input.h"
+#include "trap.h"
+#include "var.h"
+#include "show.h"
+#include "memalloc.h"
+#include "error.h"
+#include "mystring.h"
+#include "exec.h"
+#include "cd.h"
+#include "redir.h"
+#include "builtins.h"
+
+int rootpid;
+int rootshell;
+struct jmploc main_handler;
+int localeisutf8, initial_localeisutf8;
+
+static void reset(void);
+static void cmdloop(int);
+static void read_profile(const char *);
+static char *find_dot_file(char *);
+
+/*
+ * Main routine.  We initialize things, parse the arguments, execute
+ * profiles if we're a login shell, and then call cmdloop to execute
+ * commands.  The setjmp call sets up the location to jump to when an
+ * exception occurs.  When an exception occurs the variable "state"
+ * is used to figure out how far we had gotten.
+ */
+
+int
+main(int argc, char *argv[])
+{
+	struct stackmark smark, smark2;
+	volatile int state;
+	char *shinit;
+
+	(void) setlocale(LC_ALL, "");
+	initcharset();
+	state = 0;
+	if (setjmp(main_handler.loc)) {
+		if (state == 0 || iflag == 0 || ! rootshell ||
+		    exception == EXEXIT)
+			exitshell(exitstatus);
+		reset();
+		if (exception == EXINT)
+			out2fmt_flush("\n");
+		popstackmark(&smark);
+		FORCEINTON;				/* enable interrupts */
+		if (state == 1)
+			goto state1;
+		else if (state == 2)
+			goto state2;
+		else if (state == 3)
+			goto state3;
+		else
+			goto state4;
+	}
+	handler = &main_handler;
+#ifdef DEBUG
+	opentrace();
+	trputs("Shell args:  ");  trargs(argv);
+#endif
+	rootpid = getpid();
+	rootshell = 1;
+	INTOFF;
+	initvar();
+	setstackmark(&smark);
+	setstackmark(&smark2);
+	procargs(argc, argv);
+	pwd_init(iflag);
+	INTON;
+	if (iflag)
+		chkmail(1);
+	if (argv[0] && argv[0][0] == '-') {
+		state = 1;
+		read_profile("/etc/profile");
+state1:
+		state = 2;
+		if (privileged == 0)
+			read_profile("${HOME-}/.profile");
+		else
+			read_profile("/etc/suid_profile");
+	}
+state2:
+	state = 3;
+	if (!privileged && iflag) {
+		if ((shinit = lookupvar("ENV")) != NULL && *shinit != '\0') {
+			state = 3;
+			read_profile(shinit);
+		}
+	}
+state3:
+	state = 4;
+	popstackmark(&smark2);
+	if (minusc) {
+		evalstring(minusc, sflag ? 0 : EV_EXIT);
+	}
+state4:
+	if (sflag || minusc == NULL) {
+		cmdloop(1);
+	}
+	exitshell(exitstatus);
+	/*NOTREACHED*/
+	return 0;
+}
+
+static void
+reset(void)
+{
+	reseteval();
+	resetinput();
+}
+
+/*
+ * Read and execute commands.  "Top" is nonzero for the top level command
+ * loop; it turns on prompting if the shell is interactive.
+ */
+
+static void
+cmdloop(int top)
+{
+	union node *n;
+	struct stackmark smark;
+	int inter;
+	int numeof = 0;
+
+	TRACE(("cmdloop(%d) called\n", top));
+	setstackmark(&smark);
+	for (;;) {
+		if (pendingsig)
+			dotrap();
+		inter = 0;
+		if (iflag && top) {
+			inter++;
+			showjobs(1, SHOWJOBS_DEFAULT);
+			chkmail(0);
+			flushout(&output);
+		}
+		n = parsecmd(inter);
+		/* showtree(n); DEBUG */
+		if (n == NEOF) {
+			if (!top || numeof >= 50)
+				break;
+			if (!stoppedjobs()) {
+				if (!Iflag)
+					break;
+				out2fmt_flush("\nUse \"exit\" to leave shell.\n");
+			}
+			numeof++;
+		} else if (n != NULL && nflag == 0) {
+			job_warning = (job_warning == 2) ? 1 : 0;
+			numeof = 0;
+			evaltree(n, 0);
+		}
+		popstackmark(&smark);
+		setstackmark(&smark);
+		if (evalskip != 0) {
+			if (evalskip == SKIPRETURN)
+				evalskip = 0;
+			break;
+		}
+	}
+	popstackmark(&smark);
+}
+
+
+
+/*
+ * Read /etc/profile or .profile.  Return on error.
+ */
+
+static void
+read_profile(const char *name)
+{
+	int fd;
+	const char *expandedname;
+
+	expandedname = expandstr(name);
+	if (expandedname == NULL)
+		return;
+	INTOFF;
+	if ((fd = open(expandedname, O_RDONLY | O_CLOEXEC)) >= 0)
+		setinputfd(fd, 1);
+	INTON;
+	if (fd < 0)
+		return;
+	cmdloop(0);
+	popfile();
+}
+
+
+
+/*
+ * Read a file containing shell functions.
+ */
+
+void
+readcmdfile(const char *name)
+{
+	setinputfile(name, 1);
+	cmdloop(0);
+	popfile();
+}
+
+
+
+/*
+ * Take commands from a file.  To be compatible we should do a path
+ * search for the file, which is necessary to find sub-commands.
+ */
+
+
+static char *
+find_dot_file(char *basename)
+{
+	char *fullname;
+	const char *opt;
+	const char *path = pathval();
+	struct stat statb;
+
+	/* don't try this for absolute or relative paths */
+	if( strchr(basename, '/'))
+		return basename;
+
+	while ((fullname = padvance(&path, &opt, basename)) != NULL) {
+		if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) {
+			/*
+			 * Don't bother freeing here, since it will
+			 * be freed by the caller.
+			 */
+			return fullname;
+		}
+		stunalloc(fullname);
+	}
+	return basename;
+}
+
+int
+dotcmd(int argc, char **argv)
+{
+	char *filename, *fullname;
+
+	if (argc < 2)
+		error("missing filename");
+
+	exitstatus = 0;
+
+	/*
+	 * Because we have historically not supported any options,
+	 * only treat "--" specially.
+	 */
+	filename = argc > 2 && strcmp(argv[1], "--") == 0 ? argv[2] : argv[1];
+
+	fullname = find_dot_file(filename);
+	setinputfile(fullname, 1);
+	commandname = fullname;
+	cmdloop(0);
+	popfile();
+	return exitstatus;
+}
+
+
+int
+exitcmd(int argc, char **argv)
+{
+	if (stoppedjobs())
+		return 0;
+	if (argc > 1)
+		exitshell(number(argv[1]));
+	else
+		exitshell_savedstatus();
+}